Asus Cube Problem accesing goolge play [RPC:S-7:AEC-7]

I am a happy owner of a ASUS Cube. But last week I need to perform a Factory reset and since then I could not update or install any free o purchased application.

I get the error [RPC:S-7:AEC-7]. I google it and erase all the data from google play services and google macro services. but nothing....I also perform several Factory reset with a new google account and nothing...